1/*
  2 * mm/kmemleak-test.c
  3 *
  4 * Copyright (C) 2008 ARM Limited
  5 * Written by Catalin Marinas <catalin.marinas@arm.com>
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License version 2 as
  9 * published by the Free Software Foundation.
 10 *
 11 * This program is distributed in the hope that it will be useful,
 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14 * GNU General Public License for more details.
 15 *
 16 * You should have received a copy of the GNU General Public License
 17 * along with this program; if not, write to the Free Software
 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 19 */
 20
 21#define pr_fmt(fmt) "kmemleak: " fmt
 22
 23#include <linux/init.h>
 24#include <linux/kernel.h>
 25#include <linux/module.h>
 26#include <linux/slab.h>
 27#include <linux/vmalloc.h>
 28#include <linux/list.h>
 29#include <linux/percpu.h>
 30#include <linux/fdtable.h>
 31
 32#include <linux/kmemleak.h>
 33
 34struct test_node {
 35	long header[25];
 36	struct list_head list;
 37	long footer[25];
 38};
 39
 40static LIST_HEAD(test_list);
 41static DEFINE_PER_CPU(void *, kmemleak_test_pointer);
 42
 43/*
 44 * Some very simple testing. This function needs to be extended for
 45 * proper testing.
 46 */
 47static int __init kmemleak_test_init(void)
 48{
 49	struct test_node *elem;
 50	int i;
 51
 52	pr_info("Kmemleak testing\n");
 53
 54	/* make some orphan objects */
 55	pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
 56	pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
 57	pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
 58	pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
 59	pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
 60	pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
 61	pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
 62	pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
 63#ifndef CONFIG_MODULES
 64	pr_info("kmem_cache_alloc(files_cachep) = %p\n",
 65		kmem_cache_alloc(files_cachep, GFP_KERNEL));
 66	pr_info("kmem_cache_alloc(files_cachep) = %p\n",
 67		kmem_cache_alloc(files_cachep, GFP_KERNEL));
 68#endif
 69	pr_info("vmalloc(64) = %p\n", vmalloc(64));
 70	pr_info("vmalloc(64) = %p\n", vmalloc(64));
 71	pr_info("vmalloc(64) = %p\n", vmalloc(64));
 72	pr_info("vmalloc(64) = %p\n", vmalloc(64));
 73	pr_info("vmalloc(64) = %p\n", vmalloc(64));
 74
 75	/*
 76	 * Add elements to a list. They should only appear as orphan
 77	 * after the module is removed.
 78	 */
 79	for (i = 0; i < 10; i++) {
 80		elem = kzalloc(sizeof(*elem), GFP_KERNEL);
 81		pr_info("kzalloc(sizeof(*elem)) = %p\n", elem);
 82		if (!elem)
 83			return -ENOMEM;
 84		INIT_LIST_HEAD(&elem->list);
 85		list_add_tail(&elem->list, &test_list);
 86	}
 87
 88	for_each_possible_cpu(i) {
 89		per_cpu(kmemleak_test_pointer, i) = kmalloc(129, GFP_KERNEL);
 90		pr_info("kmalloc(129) = %p\n",
 91			per_cpu(kmemleak_test_pointer, i));
 92	}
 93
 94	return 0;
 95}
 96module_init(kmemleak_test_init);
 97
 98static void __exit kmemleak_test_exit(void)
 99{
100	struct test_node *elem, *tmp;
101
102	/*
103	 * Remove the list elements without actually freeing the
104	 * memory.
105	 */
106	list_for_each_entry_safe(elem, tmp, &test_list, list)
107		list_del(&elem->list);
108}
109module_exit(kmemleak_test_exit);
110
111MODULE_LICENSE("GPL");